Shank and bit punch



W. A. SMITH.

SHANK AND BIT PUNCH.

APPLICATION FILED APR. 24, 1920.

Patented Nov. '1, 1921.

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dd ATTO NEYl W. A. SMITH.

SHANK AND BIT PUNCH.

APPLICATION FILED APR.24,1920.

1,395,747 Patented Nov. 1,1921.

3 SHEETS-SHEET 2.

IN V EN-TOR.

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W. A. SMITH.

SHANK AND BIT PUNCH.

APPLICATION FILED ABR.24, I920.

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master.

T 0 all whom it may Be it known that STON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND JERSEY, A CORPORATION OF NEW JERSEY.

SHANE AND BIT PUNCH.

Specification of Letters Patent.

Patented Nov. 1, 1921.

Application filed April 24, 1920. Serial No. 376,306.

concern:

I, WILLIAM A. SMITH,

a citizen of the United States, residing at Easton, in the county 5 State of Pennsylvania,

of Northampton and have invented a certain new and useful Improvement in Shank and Bit Punches,

This invention of which the following is a specification.

relates to machines for punching. the bits and shanks of hollow drill steels or similar tools,

cially durin the and re-shanking th the holes in the bits or shanl quired extent after the operations.

The primary secure a quick which a pin may the hollow steel or der complete control of Difiiculty is sometimes pushing a pin into for use more espeprocesses of sharpening e steels, in order to reopen 5* to the reheating and forging object of the invention is to acting-machine by means of be accurately driven into the operator.

experlenced in a hollow steel or tool, es-

pecially at the shank end, which may require deeper punching than the bit end, and an object of the present invention is to enable the pin to be automatically tapped or hammered into the too by fluid actuatedmechanism is fed forward,

merely pushed in.

Another object of the invention is to provide manual actuating the punching mechanism forward, may be started and l or article to be punched means as the punching instead of being means for feeding whic stopped as desired. Any

suitable means, as a spring, may be provided for returning the punching mechanism to its initial or starting the manual force feeding movement Means may position upon release of applied for the forward also preferably be provided for automatically admitting fluid pressure to the punching mechanism after the forward feeding movement has been started by the manual feeding means and for cutting off said fluid pressure upon punching mechanism the return of the to starting position.

Further objects of the invention will hereinafter appear and to all of these ends the invention consists struction and combinations scribed and claime of the features of conof elements ded in this specification and shown in the accompanying drawings in which- Figure 1 is a si de elevation of a bit and longitudinal section of tool and withdrawn un-- shank punch shown mounted on a drill sharpener for convenience,

Fig. 2 is an enlarged longitudinal sectional elevation of the fluid actuated punchmg mechanism partly broken away,

Fig. 3 is a side elevation of a modified form of mechanism,

Fig. 4 is anenlarged detail view partly in D a pin holder forming an anvil block and means for removably holding a pin in the holder,

Fig. 5 is a transverse sectional view on the line 5-5 of Fig. 4 looking in the direction of the arrows,

Fig. 6 isa view similar to Fig. 4 of a moiified form of pin holder and anvil block, an

Fig. 7 is a transverse sectional view on the line 7-7 of Fig, 6 looking in the direction of the arrows.

The punching machine may be mounted upon a separate pedestal but for convenience the machine is shown attached to a drill sharpener A the outline of which is indicated in dot and dash lines, so that the jaws B and C of the drill sharpener may be utilized for clamping the drill steel D in place during the punching.

As shown in this instance a bracket E is suitably secured to the frame of the drill sharpener A as by means of the bolts F and guiding means preferably in the form of a guide bar G extends horizontally from the bracket E, in convenient position for slidably supporting-the fluid actuated punching mechanism opposite the location of the drill steel D or article to be punched.

The punching mechanism forming one element of this invention preferably comprises a percussive tool of the hammer type having a cylinder casing H suitably mounted upon a carriage J slidably supportedupon the guide G but held from rotation by a suitable key K. A punch in the form of a pin L is adapted to be tapped or hammered into the drill steel D by blows in one direction of the hammer piston O reciprocating in the cylinder casing H and hammered out of the drill steel by blows of the hammer piston in the opposite direction. Suitable manually actuated means controlled either by the foot or hand of the operator as indicated in Figs. 1 and 3 are preferably provided for bodily feeding the punching mech anism' forward as the hammer operates.

Suitable spring actuated means under the influence of the spring P may be provided for bodily returning the punching mechanism to initial position as the hammer piston operates, but the invention is not to be understood as limited to spring actuated feed back mechanism, for this is only one convenient method of feeding back. lVithout the spring P, the entire punching mechanism could be actuated both forward and backward by manual means under direct control of the operator as the hammer piston operates and in some instances, such operation might be preferable.

The punching mechanism in the form of a percussive tool may be of any suitable or usual construction and in this instance the cylinder casing H is provided with the front head Q, the back head and the back end portion S, all adapted to be secured together and to the collar T of the carriage J as by means of the side bolts U. A suitable anvil block V has a limited movement within the front head Q and forms a holder for the pin L which may be inserted within the end of the anvil block or holder V and held in place by means of the transverse pin W shown in detail in Figs. 4 and 5. The pin is retained in position by means of a suitable retainer in the form of a circular spring X having apertures in its ends through which the pin passes. In Fig. 2 the anvil block V is shown in its rearward position in the front head Q and in the path of the piston to receive the impact blows.

In the modification of the pin retaining means shown in Figs. 6 and 7, a short pin Y is held within the pin holder V by means of the spring sleeve Z.

The percussive tool forming the punching mechanism is constructed in any suitable manner to provide for the distribution of fluid pressure to the portions of the cylinder for actuating the hammer piston O, in this instance fluid pressure being admitted at the inlet a and in the position of the parts shown in Fig. 2 passes through the passage way Z) and port 0, to the forward portion of the cylinder and thence through the port (Z and passage way e to the rearward portion of the cylinder as indicated by the arrows for operating the piston forward. The rearward portion of the cylinder is exhausted through the exhaust port 7 and during the operation of the tool constant pressure is maintained on the rearwardly acting surface of the piston formed by the shoulder g forming a cushion on the forward stroke. As the punching mechanism is moved backwardly or retracted along the guide bar G the anvil block V assumes its forward position in the front head out of the path of the piston.

A spring controlled valve h is preferably provided in the end portion S of the mapunching mechanism is chine for automatically controlling the, starting and stopping of the piston. This valve is provided with an extension j adapted to bear against the stop is when the in retracted position, thus automatically shutting off the supply of fluid pressure to the cylinder. After the punching mechanism is moved away from the stop 7: the valve h automatlcally opens and the piston is started in operation.

In Fig. 1 suitable means are shown actuated and controlled by the foot of the operator for moving the punching mechanism forward as the pin L is hammered into the drill steel or article to be punched. Any suitable means may be provided for this purpose and in this instance the bell crank lever 0 is pivoted at p to the bracket E, one arm of the bell crank lever being connected to the carriage J by the link 9, the other arm being connected to a foot lever r by means of the spring pressed rod 8 sliding within the socket t. A spring 10 is adapted to be compressed between the flange 1) on the rod 8 and the end of the socket t, so that upon pressing down on the outer end of the foot lever r, the bell crank lever 0 is rocked to feed the punching mechanism forward, and the compression spring it acts to take up the vibration in the links and levers. Upon releasing the pressure applied by the foot of the operator, the retracting spring returns the punching mechanism to its initial or starting position as the pin L is hammered out of the drill steel.

In the modification of the invention shown in Fig. 3 hand operated means are prox'ided for feeding the punching mechanism forward. In this instance a rod 20 is slidably inserted within a sleeve 00 pivoted at ;2 to the carriage J. The rod w may be provided with a collar .2 between which and the sleeve 00 a spring 2 is placed. Another spring 3 is preferably placed between the sleeve .1 and a nut 4 at the end of the rod to, these springs 2 and 3 being for the purpose of taking up vibration. The rod w is pivoted at 5 to a hand lever 6 which in turn is pivoted at the point 7 to the bracket E. As the hand lever 6 is pulled forward toward the operator, the punching mechanism is fed forward and upon release of the force supplied by'hand, the retracting spring P returns the punching mechanism to its initial or starting position.

I claim 1. In a machine for re-opening the bits and shanks of hollow drill steels and similar tools, the combination of means for .holding the drill steel, a pin adap ed to enter the drill steel, punching mechanism in the form of a fluid actuated hammer tool for hammering the pin into the drill steel, said hammer tool having a reciprocatingpiston and an ing the tool, said pin being anvil block located at the forward end carrying said pin, and manually actuated means for feeding the punching mechanism forward.

2. In a machine for re-opening the bits and shanks of hollow drill steels and similar tools, the combination of means for holding the drill steel, a pin adapted to enter the drill steel, punching mechanism in the form of a fluid actuated hammer tool for hammering the pin into the drill steel, said hammer tool having a reciprocating piston, an anvil block;located at the for- Ward end and having limited longitudinal movement in the tool, said pin being carrie by the anvil block, manually actuated means for feeding the punching mechanism forward, and means for returning the punchmechanism as the pin is withdrawn from the drill steel.

3. In a machine for re-opening the bits and shanks of hollow drill steels and similar tools, the combination of means for bolding the drill steel, a pin adapted to enter the drill steel, punching mechanism in the form of a fluid actuated hammer tool for hammering the pin into the drill steel, said hammer tool having a reciprocating piston, an anvil block located at the front end and having limited longitudinal movement in carried by the anvil block, and manually actuated means for feeding the punching mechanism forward against spring pressure, saidspring pressure acting to return the punching mechanism as the pin is withdrawn from the drill steel, when the manual force applied is released.

4. In a machine for re-opening the bits and shanks of hollow drill steels and similar tools, the combination of means for holding the drill steel, a pin adapted to enter the drill steel, punching mechanism in the form of fluid actuated means for hammer.- ing the pin into the drill steel, manually actuated means for feeding the punching mechanism forward and automatic means for admitting fluid pressure to the punching mechanism after the feeding movement has been started by the said manual means.

5. In a machine for re-opening the bits and shanks of hollow drill steels and similar tools, the combination of means for holding the drill steel, a pin adapted to enter the drill steel, punching mechanism in the form of fluid actuated means for hammering the pin into the drill steel,

. direction, manually manually actuated means for feeding the punching mechanism forward and for returning the punching mechanism as the pin -is Withdrawn, and automatic means for admitting fluid pressure to the punching mechanism after the forward feeding movement.

ing the drill steel, a pin adapted to enter the d drill steel,

hammer the pin into the drill steel by re fluid actuated means adapted to in one direction and hammer of the drill steel by repeated direction, and manually actuated means for feeding the hammering device lineally forward along the axis of the drill steel. 7. In a machine for re-opening the bits and shanksof hollow drill steels and similar tools, the combination of means for holding the drill steel, a enter the drill steel, fluid actuated means adapted to hammer the pin into the drill steel by repeated blows in one direction and hammer the pin out of the drill steel by repeated blows in the opposite actuated devices for feeding the hammering device lineally forward along the axis of the drill steel, and shock absorbing means locatedbetween the hammering device and the manually actupeate'd blows the pin out blows in the opposite pin adapted to.

ated devices to reduce vibration in the said manual devices.

8. In a machine for re-opening the bits and shanks of hollow drill steels and similar tools, the combination of means for holding the drill steel a pin adapted to enter the drill steel, fluid actuated means adapted to hammer the pm into the drill steel by repeated blows in one direction and hammer the pin out of the drill steel by repeated set my hand.

WILLIAM A. SMITH. 

